Dust deflector



June 14, 1938. J. B ERNFELD DUST DEFLECTOR Filed July 14, 1956 Fig.1

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Patent ed June 14, 1938 UNITED STATES DUST namc'roa PATENT. OFFICE JamesBernfeld, Newark, -N.' J.-

Application July 14, 1936, Serial No. 90,454

Claims. This invention relates to a dust deflecting device for vacuumcleaner dust bags and an object of this invention is to prevent theclogging of the mouth of a vacuum cleaner bag with an accumulation ofdust.

Another object of this invention is to provide a dust deflectingfunnel-shaped member having end of the tubular a tubular end which maybe inserted into the rigid tubular mouth of a vacuum cleaner dust bagand retained in frictional engagement all around the inner circumferenceof said mouth and serving to keep the accumulated dust away from themouth of the bag.

I Another object of thisinvention is to provide an outwardly distendingelastic resilient band encircling the inner circumference of the rigidtu-- bular mouth of a dust bag for retaining the dust deflecting membertherein.

Another object of this invention is to provide an elongated dustdeflector made of material having an element of rigidity whereby thedeflector will retain its elongated form while permitting transverseflexure in service.

Another object of this invention is to form the deflector body withoutwardly extending means serving to space the dust deflector inwardlyof the inner surface of the dust bag and provid-' ing a storage spaceintermediate thedeflector body and the dust bag for collecting the dustdis-' charged into the dust bag in anarearemoved from the mouth of thebag.

Another object of this invention is to provideresponding partsthroughout the several views,

in which: Figure 1 is a longitudinal cross-sectional view of a vacuumcleaner dust bag and a dust deflector in assembled relation, the dustbag being in an inflated position.

Figure 2 is a bottom view of the assembled metal mouth of the dust bagand the dust deflector.

Figure 3 is a'cross-sectional view of a modified dust deflecting member,the section being taken as on line 3-3 in Figure 4.

Figure 4 is a bottom plan view of the modified dust deflecting membershown in Figure 3, which may be molded in one piece and may have anintegral outwardly extending flange serving to space the dust deflectoraway from the inner surface of the dust bag.

In the illustrated embodiment of the invention, the numeral l0 indicatesa vacuum cleaner dust bag which is usually formed of woven fabric and isprovided wltha tubular metal sleeve Ii at its lower end.

The sleeve ii is adapted to receive a discharge nozzle of a vacuumcleaner and be engaged thereto in any suitable manner- (not shown). The

sleeve H has a reduced upper end l2. The neck portion '13 of the dustbag is slipped over the end 62 and a tightly drawn metallic band i4 isused to clamp the sleeve II in unitary relation to the bag and so thatthe sleeve forms the mouth- !5 of the bag I0.

For the purpose of preventing theclogging of the mouth I5 with theaccumulated dust, I have provided a funnel-shaped dust deflector I6which maybe made of a fiat piece of sheet material having its oppositeside edges lapped radially along a longitudinal line I1 and preferablyJoined 'by eyelets I8. ,The dust deflector l6 has a tubular lower end 99comprising two circumferentially overlapping flaps 21 which permit saidend to be distende'd'or contracted indiameter' while in full contact allaround the inner circumference ofthe reduced upper end I? of the sleeveii.

The dust deflector I6 is to be mounted inside the mouth l5 of the dustbag Ill with the tubular end is inside the upper end ii of the sleeve iI A slit resilient band 20 of substantially annular form andnormally oflarger diameter than the inner diameter of the tubular end i2 is thencontracted in diameter and placed inside the end l9 of the dustdeflector; The distending band presses the material of the deflectoroutwardlyand holds it in frictional engagement all around themouth ofthe dust bag. I

The dust deflector It may be made of sheet rubber or other materialhaving'suflicient thickness or body so 'as tobe somewhat rigid and becapable of maintaining-its elongated tubular form under all serviceconditions without collapsing or vfalling down and constricting the neckI5.

When the motor is in operation, the dust fiowing u through the dustdeflector-l6 follows the direction shown by the arrows and settles downin the annular space between the dust bag 10 and Rosam- .quantity ofdust 2i accumulates without the dust deflector i8 and agraduallyincreasing clogging the mouth l5.

As shown in Figures 3 and 4, I have provided a modified dust deflector21 which may be molded in one piece and may preferably have a tubigarbody 22 and an integral outwardly extendi g flange 23 which is of largerextent than the body 22. The flange 23 serves to space the dustdefiector away from the inner surface of the dust bag It shown inFigure 1. A plurality of apertures 24 are provided in the flange 23 topermit the dust coming through the mouth Id of the bag Ill to passtherethrough and collect in the storage space 25, shown in Figure 1.

, As dust bags are usually constructed, the size of the bag is verylarge but due to the fact that the collected dust settles back at or onthe mouth of the bag, the mouth of the bag gets clogged when only asmallamount of dust accumulates and this impairs the efficiency of thesuction of the vacuum cleaner.

The structure herein described prevents the dust from collecting at themouth of the -bag and this increases the storage capacity of a dust bagwithout impairing the efllciency of the suction.

Due to the fact that the body of the dust deflector herein described hasan element of rigidity, the collected dust cannot, at any time, press inthe sides of the deflector and clog the mouth of the dust bag. Also, dueto the rigidity of the body of the dust deflector it is possible todetach the dust bag from the vacuum cleaner nozzle without dropping anyof the collected dust. When a dust bag fllled with dust is to beemptied, the clamp 26 is removed irom thev dust bag and the dust isemptied through the top, in the usual manner.

In accordance with the provisions of the patent statutes I havedescribed the operation of a my invention, together with the form ofdevice which I now consider to represent the best embodiment thereof;but I desire to have it understood that, the device shown is onlyillustrative and that the invention may be carried out by other meanswithin the scope of the appended claims.

It is to be noted that materials having an element of rigidity, such asthick sheet rubber or a stiff buckram fabric which may be used for thedust deflector, will be strong enough to maintain the tubular shapewhile permitting transverse flexure in service, such as occurs when thedust bag is repeatedly lowered and raised.

A rigid dust deflector without transverse flexure would quickly wear outand destroy the dust bag while a dust deflector made of soft materialwithout an element of rigidity wouldcollapse and destroy the pernianentstorage space desired between the elongated dust deflector body and thebody of the dust bag.

It is also to be noted that while I have shown overlapping flaps 21 topermit the tubular end of the dust deflector to be distended orcontracted in diameter, so that the dust deflector will be readilyinterchangeable for use in vacuum cleaner bags havingdifl'erent sizemouths, that the said flaps may be'taken as representingany suitablemeans for performing the same function.

I claim:-

1-. The combination with a'dust collecting vac-' uum cleaner bag and anelongated dust deflecting funnel-shaped member therein, said bag havinga unitary tubular metal mouth and said dust deflecting member having atubular end insertable in said mouth, overlapping means in. said tubularend for distending said end prior to insertion in said mouth, and anoutwardly distending elastic resilient band encircling the innercircumference 'of said mouth and retaining said tubular end infrictional engagement all around the inner circumference of said mouth,the body of said dust deflecting member having an element of rigiditywhereby said member retains its elongated form while permittingtransverse flexure in service.

2. The combination with a dust collecting vacuum cleaner bag having aunitary tubular metal mouth and an elongated dust deflecting membertherein, said dust deflecting member having a tubular end insertable insaid mouth, an outwardly distending elastic resilient band encirclingthe inner circumference of said tubular end and retaining said end infrictional engagement with the inner circumference ofsaid mouth, the

body of said dust deflecting member having an element of rigiditywhereby said member retains its elongated form while permittingtransverse flexure in service, one end of said deflecting member havingoutwardly extending means serving to space said member inwardly of theside wall surfaces of said dust bag and forming a storage spaceintermediate said deflecting member and said dust bag for collectingthedust discharged into said bag without clogging said mouth.

3. The combination with a dust collecting vacuum cleaner bag and a dustdeflecting member, said bag having a tubular mouth and said dustdeflecting member having a tubular end, means for engaging the tubularend of said dust deflector and the mouth of said dust bag into unitaryrelation, the body of said dust deflecting member having an element ofrigidity and being adapted to maintain a position longitudinally of thedust bag, whereby air discharged into said dust bag will cause thesurfaces of said bag to .be spaced away from the exterior surface ofsaid deflecting member and form a storage space therebetween forcollecting dust without clogging the mouth of said dust bag, andoutwardly extending means on said dust deflector for spacing saiddeflector away from the inner surface of said dust bag.

4. The combination with a dust collecting vac uum cleaner bag and a dustdeflecting member, said bag having a tubular mouth and said dustdeflecting member having a tubular end designed for engagement aroundthe mouth of said dust bag, the body of said dust deflecting memberhaving an element of rigidity and-being adapted to maintain a positionlongitudinally of the dust bag, whereby air discharged into said dustbag will cause the surfaces of said bag to one end thereof, said flangebeing in angular rebody portion.

lation with said tubular JAMES BERNFELD.

4 DISCLAIMER 2,120,347.-Jamea Bemfeld, Newark N. J. Due'r. Dmmnc'ron.Patent dated June 14, 1938. Disclaimer filed May 26, 1939, by thepatentee.

Hereby disclaims all the subject mat r'recited in' claim 5 of PatentNumber 2 120,347-except where the flange is spaced 8. ve the lower endof the deflector within Q bag and serves mechanically to hold the bag inspaced relation to the deflector to form a duet collecting chamberbetween the deflector and the lower: end of the bag,

' [Oficial Game June 20, 1939.

